You and your man claim you've been "tested for everything," but different doctors test for different STDs, so make sure you know what you're actually been scanned for. For example, Dr. Streicher's battery scans for gonorreah, chlamydia, hepatitis, HIV, herpes and syphilis, but not all docs are as comprehensive.
Even if you don't have sex with a guy, and even if he's a virgin, he can still give you HPV. The virus (which can give you genital warts or cervical cancer) is spread through skin-to-skin contact, not semen, so if he's been naked and rubbed his penis against another woman's vagina during a hookup, he can pass it to you the same way. (Unfortunately there's no way to test a dude for HPV.)